<template>
  <view class="goods-detail-container" v-if="goods_info.goods_name">
    <!-- 头部轮播图区域 -->
    <swiper
      :indicator-dots="true"
      :autoplay="true"
      :interval="3000"
      :duration="1000"
      :circular="true"
    >
      <swiper-item v-for="(item, i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>
    <!-- 商品信息 -->
    <view class="goods-info-box">
      <view class="price">￥{{ goods_info.goods_price }}</view>
      <view class="goods-info-body">
        <view class="goods-name">{{ goods_info.goods_name }}</view>
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <view class="yf">快递：免运费</view>
    </view>
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>
    <!-- 购物车工具栏 -->
    <view class="goods_nav">
      <uni-goods-nav
        :fill="true"
        :options="options"
        :buttonGroup="buttonGroup"
        @click="onClick"
        @buttonClick="buttonClick"
      />
    </view>
  </view>
</template>

<script>
import { mapMutations, mapGetters } from "vuex";
export default {
  data() {
    return {
      goods_info: null,
      options: [
        {
          icon: "shop",
          text: "店铺",
        },
        {
          icon: "cart",
          text: "购物车",
          info: 0,
        },
      ],
      buttonGroup: [
        {
          text: "加入购物车",
          backgroundColor: "#ff0000",
          color: "#fff",
        },
        {
          text: "立即购买",
          backgroundColor: "#ffa200",
          color: "#fff",
        },
      ],
    };
  },
  onLoad(options) {
    const goods_id = options.goods_id;
    this.getGoodsDetail(goods_id);
    this.options[1].info = this.total;
  },
  computed: {
    ...mapGetters("m_cart", ["total"]),
  },
  watch:{
    total(){
      //监听total发生改变时即执行以下代码
      this.options[1].info = this.total
    }
  },
  methods: {
    ...mapMutations("m_cart", ["addToCart"]),
    async getGoodsDetail(goods_id) {
      const res = await uni.$request({
        url: "goods/detail",
        data: {
          goods_id,
        },
      });
      if (res.meta.status === 200) {
        //使用replace（）方法将img添加含内的style样式，以及将webp后缀替换为jpg格式
        res.message.goods_introduce = res.message.goods_introduce
          .replace(/<img/g, '<img style="display:block;"')
          .replace(/webp/g, "jpg");
        this.goods_info = res.message;
      }
    },
    preview(i) {
      uni.previewImage({
        current: i,
        urls: this.goods_info.pics.map((item) => item.pics_big),
      });
    },
    onClick(e) {
      if (e.content.text === "购物车") {
        uni.switchTab({ url: "/pages/cart/index" });
      }
    },
    buttonClick(e) {
      if (e.content.text === "加入购物车") {
        // 2. 组织一个商品的信息对象
        const goods = {
          goods_id: this.goods_info.goods_id, // 商品的Id
          goods_name: this.goods_info.goods_name, // 商品的名称
          goods_price: this.goods_info.goods_price, // 商品的价格
          goods_count: 1, // 商品的数量
          goods_small_logo: this.goods_info.goods_small_logo, // 商品的图片
          goods_state: true, // 商品的勾选状态
        };
        // 3. 通过 this 调用映射过来的 addToCart 方法，把商品信息对象存储到购物车中
        this.addToCart(goods);
      }
    },
  },
};
</script>

<style lang="scss" scoped>
.goods-detail-container {
  // 给页面外层的容器，添加 50px 的内padding，
  // 防止页面内容被底部的商品导航组件遮盖
  padding-bottom: 50px;
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }
  // 商品信息区域的样式
  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .price {
      color: #c00000;
      font-size: 18px;
      margin: 10px 0;
    }

    .goods-info-body {
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        padding-right: 10px;
      }
      // 收藏区域
      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        border-left: 1px solid #efefef;
        color: gray;
      }
    }

    // 运费
    .yf {
      margin: 10px 0;
      font-size: 12px;
      color: gray;
    }
  }
  .goods_nav {
    // 为商品导航组件添加固定定位
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }
}
</style>